Final answer:
The most suitable choice for Jessica is to ask the manager what positions are available and list one that matches her skills and interests, indicating that she is prepared and earnest in her intent to join the company.
Step-by-step explanation:
When filling out a job application, it is crucial to list a specific position in the "Position Applied for" box to demonstrate that you have done your research and are interested in a particular role. Therefore, the best option for Jessica would be to ask the manager what positions are available and then list one that fits her qualifications and career interests. This approach shows that she is both prepared and serious about joining the company in a capacity where she can be an asset. Moreover, this strategy aligns with the idea of selling oneself to a company, focusing on how one can fulfill the company's needs and meet its criteria.